Many thanks go out to Tom McIntyre for sending me these photos of his early prototype cross ram manifold so we can all enjoy them. Wayne Guinn's book Camaro: Untold Secrets is a great resource for learning more about these manifolds.

Here's a shot of Tom's manifold as seen from above. The rear of the manifold is to the right.

A view of the manifold as seen from the rear. The hex-head brass plug is not original.

A view of the manifold as seen from the front. The gasket between the lid and base is much thicker than original.

A look down through one of the carburetor openings.

This view shows the lid removed and flipped upside down.

Handmade fuel distribution fixes are seen here at the inside/front of the manifold by intake runners #1 and #3.

Another fuel distribution fix, this one to the rear of the #4 intake runner.

A look at the bottom side of the manifold showing a heat shield riveted in place.

Another look at the heat shield. These heat shields were only used on the prototypes and thendiscontinued on the production manifolds. They weren't found to be necessary.

Some material has been added to raise the height of the port and some grinding is evident to clean up that area, as well as to to match up with the cylinderhead ports. Also of note are the oval shaped holes for the intake mounting bolts which probably were necessitated by a decked block and/or milled heads.

Another look at the bottom of the manifold, this time as seen from the front. The shape of the front of the prototype manifoldsaround the waterneck area is different than the production units.

Same thing but this time from the rear. The casting date and part number are under this shield, which has never been disturbed.Another prototype base which has had its shield removed showed a casting number of 0-310510.

The casting numbers on the lid of this manifold. Casting number for this piece is 0-310512.

Closer view and different angle. Casting date which looked like 12-8-67 above appears like it might be 12-3-67.

Someone has put a freeze plug in the hole for the oil filler tube. The Winters Foundry markto the right is slightly larger and raised higher than on the production cross ram manifold.

1969 article on the Offenhauser cross ram, which is strikingly similar to the GM part. An interesting thing about theOffy manifold is the variety of lids they offered for it, which allowed different carbs to be used. (Jon Mello Collection)

Jon, I've read a fair bit of your articles on the crossram and find you very informative. I'm wondering if you have any info on a car that came to Canada called the Mini Mauler from Baldwin Motion Performance? I may have the original air cleaner from this car. It was a prototype. I also have a 68 prototype crossram manifold. Both were documented by Wayne Guinn and on his website. If anyone knows anything about either the air cleaner or manifold and how any racing history, I'd love to hear about it.

Jon, I also have read the Mini Mauler article and have no proof that the car was sold into Canada. But for sure the crossram and air cleaner from that car showed up in Canada. I purchased the air cleaner at a swap meet in Barrie, Ontario about the same time that someone from Georgetown, Ontario purchased the crossram. When I was at the GM Nationals several years ago I met with Mr. Thompson and had him sign the prototype air cleaner. He did a discussion in conjunction with Wayne Guinn and Rick's First Generation Parts.

Also some inter departmental memo from August 1967 regarding the crossram set up. I guess I'm looking for anyone with owner history of that green 68 Z/28 that had the crossram installed by Motion. If I had the VIN I could find out if it was ever registered in Canada, or if the manifold was removed then ended up here.

I had a schedule conflict and couldn't attend that show but really wanted to. I don't have a VIN for that Mini Mauler car. Sure wish I did but no such luck. Nice to know that you can look up a car's registration history up there in Canada. If I can come up with a VIN of an interesting car that may have Canadian history, I might give you a job to do.